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-
- #ifdef WITH_SGI_DL
- #define USE_DL
- #endif
-
- #include <stdlib.h>
- #include <stdio.h>
- #include <signal.h>
- #include <sys/types.h>
- #include <sys/wait.h>
- #include <sys/prctl.h>
- #include <ulocks.h>
- #include <errno.h>
-
- #define HDR_SIZE 2680 /* sizeof(ushdr_t) */
- #define MAXPROC 100 /* max # of threads that can be started */
-
- static usptr_t *shared_arena;
- static ulock_t count_lock; /* protection for some variables */
- static ulock_t wait_lock; /* lock used to wait for other threads */
- static int waiting_for_threads; /* protected by count_lock */
- static int nthreads; /* protected by count_lock */
- static int exit_status;
- #ifndef NO_EXIT_PROG
- static int do_exit; /* indicates that the program is to exit */
- #endif
- static int exiting; /* we're already exiting (for maybe_exit) */
- static pid_t my_pid; /* PID of main thread */
- static struct pidlist {
- pid_t parent;
- pid_t child;
- } pidlist[MAXPROC]; /* PIDs of other threads; protected by count_lock */
- static int maxpidindex; /* # of PIDs in pidlist */
-
- #ifndef NO_EXIT_PROG
- /*
- * This routine is called as a signal handler when another thread
- * exits. When that happens, we must see whether we have to exit as
- * well (because of an PyThread_exit_prog()) or whether we should continue on.
- */
- static void exit_sig(void)
- {
- d2printf(("exit_sig called\n"));
- if (exiting && getpid() == my_pid) {
- d2printf(("already exiting\n"));
- return;
- }
- if (do_exit) {
- d2printf(("exiting in exit_sig\n"));
- #ifdef Py_DEBUG
- if ((thread_debug & 8) == 0)
- thread_debug &= ~1; /* don't produce debug messages */
- #endif
- PyThread_exit_thread();
- }
- }
-
- /*
- * This routine is called when a process calls exit(). If that wasn't
- * done from the library, we do as if an PyThread_exit_prog() was intended.
- */
- static void maybe_exit(void)
- {
- dprintf(("maybe_exit called\n"));
- if (exiting) {
- dprintf(("already exiting\n"));
- return;
- }
- PyThread_exit_prog(0);
- }
- #endif /* NO_EXIT_PROG */
-
- /*
- * Initialization.
- */
- static void PyThread__init_thread(void)
- {
- #ifndef NO_EXIT_PROG
- struct sigaction s;
- #endif /* NO_EXIT_PROG */
- #ifdef USE_DL
- long addr, size;
- #endif /* USE_DL */
-
-
- #ifdef USE_DL
- if ((size = usconfig(CONF_INITSIZE, 64*1024)) < 0)
- perror("usconfig - CONF_INITSIZE (check)");
- if (usconfig(CONF_INITSIZE, size) < 0)
- perror("usconfig - CONF_INITSIZE (reset)");
- addr = (long) dl_getrange(size + HDR_SIZE);
- dprintf(("trying to use addr %p-%p for shared arena\n", addr, addr+size));
- errno = 0;
- if ((addr = usconfig(CONF_ATTACHADDR, addr)) < 0 && errno != 0)
- perror("usconfig - CONF_ATTACHADDR (set)");
- #endif /* USE_DL */
- if (usconfig(CONF_INITUSERS, 16) < 0)
- perror("usconfig - CONF_INITUSERS");
- my_pid = getpid(); /* so that we know which is the main thread */
- #ifndef NO_EXIT_PROG
- atexit(maybe_exit);
- s.sa_handler = exit_sig;
- sigemptyset(&s.sa_mask);
- /*sigaddset(&s.sa_mask, SIGUSR1);*/
- s.sa_flags = 0;
- sigaction(SIGUSR1, &s, 0);
- if (prctl(PR_SETEXITSIG, SIGUSR1) < 0)
- perror("prctl - PR_SETEXITSIG");
- #endif /* NO_EXIT_PROG */
- if (usconfig(CONF_ARENATYPE, US_SHAREDONLY) < 0)
- perror("usconfig - CONF_ARENATYPE");
- usconfig(CONF_LOCKTYPE, US_DEBUG); /* XXX */
- #ifdef Py_DEBUG
- if (thread_debug & 4)
- usconfig(CONF_LOCKTYPE, US_DEBUGPLUS);
- else if (thread_debug & 2)
- usconfig(CONF_LOCKTYPE, US_DEBUG);
- #endif /* Py_DEBUG */
- if ((shared_arena = usinit(tmpnam(0))) == 0)
- perror("usinit");
- #ifdef USE_DL
- if (usconfig(CONF_ATTACHADDR, addr) < 0) /* reset address */
- perror("usconfig - CONF_ATTACHADDR (reset)");
- #endif /* USE_DL */
- if ((count_lock = usnewlock(shared_arena)) == NULL)
- perror("usnewlock (count_lock)");
- (void) usinitlock(count_lock);
- if ((wait_lock = usnewlock(shared_arena)) == NULL)
- perror("usnewlock (wait_lock)");
- dprintf(("arena start: %p, arena size: %ld\n", shared_arena, (long) usconfig(CONF_GETSIZE, shared_arena)));
- }
-
- /*
- * Thread support.
- */
-
- static void clean_threads(void)
- {
- int i, j;
- pid_t mypid, pid;
-
- /* clean up any exited threads */
- mypid = getpid();
- i = 0;
- while (i < maxpidindex) {
- if (pidlist[i].parent == mypid && (pid = pidlist[i].child) > 0) {
- pid = waitpid(pid, 0, WNOHANG);
- if (pid > 0) {
- /* a thread has exited */
- pidlist[i] = pidlist[--maxpidindex];
- /* remove references to children of dead proc */
- for (j = 0; j < maxpidindex; j++)
- if (pidlist[j].parent == pid)
- pidlist[j].child = -1;
- continue; /* don't increment i */
- }
- }
- i++;
- }
- /* clean up the list */
- i = 0;
- while (i < maxpidindex) {
- if (pidlist[i].child == -1) {
- pidlist[i] = pidlist[--maxpidindex];
- continue; /* don't increment i */
- }
- i++;
- }
- }
-
- int PyThread_start_new_thread(void (*func)(void *), void *arg)
- {
- #ifdef USE_DL
- long addr, size;
- static int local_initialized = 0;
- #endif /* USE_DL */
- int success = 0; /* init not needed when SOLARIS_THREADS and */
- /* C_THREADS implemented properly */
-
- dprintf(("PyThread_start_new_thread called\n"));
- if (!initialized)
- PyThread_init_thread();
- switch (ussetlock(count_lock)) {
- case 0: return 0;
- case -1: perror("ussetlock (count_lock)");
- }
- if (maxpidindex >= MAXPROC)
- success = -1;
- else {
- #ifdef USE_DL
- if (!local_initialized) {
- if ((size = usconfig(CONF_INITSIZE, 64*1024)) < 0)
- perror("usconfig - CONF_INITSIZE (check)");
- if (usconfig(CONF_INITSIZE, size) < 0)
- perror("usconfig - CONF_INITSIZE (reset)");
- addr = (long) dl_getrange(size + HDR_SIZE);
- dprintf(("trying to use addr %p-%p for sproc\n",
- addr, addr+size));
- errno = 0;
- if ((addr = usconfig(CONF_ATTACHADDR, addr)) < 0 &&
- errno != 0)
- perror("usconfig - CONF_ATTACHADDR (set)");
- }
- #endif /* USE_DL */
- clean_threads();
- if ((success = sproc(func, PR_SALL, arg)) < 0)
- perror("sproc");
- #ifdef USE_DL
- if (!local_initialized) {
- if (usconfig(CONF_ATTACHADDR, addr) < 0)
- /* reset address */
- perror("usconfig - CONF_ATTACHADDR (reset)");
- local_initialized = 1;
- }
- #endif /* USE_DL */
- if (success >= 0) {
- nthreads++;
- pidlist[maxpidindex].parent = getpid();
- pidlist[maxpidindex++].child = success;
- dprintf(("pidlist[%d] = %d\n",
- maxpidindex-1, success));
- }
- }
- if (usunsetlock(count_lock) < 0)
- perror("usunsetlock (count_lock)");
- return success < 0 ? 0 : 1;
- }
-
- long PyThread_get_thread_ident(void)
- {
- return getpid();
- }
-
- static void do_PyThread_exit_thread(int no_cleanup)
- {
- dprintf(("PyThread_exit_thread called\n"));
- if (!initialized)
- if (no_cleanup)
- _exit(0);
- else
- exit(0);
- if (ussetlock(count_lock) < 0)
- perror("ussetlock (count_lock)");
- nthreads--;
- if (getpid() == my_pid) {
- /* main thread; wait for other threads to exit */
- exiting = 1;
- #ifndef NO_EXIT_PROG
- if (do_exit) {
- int i;
-
- /* notify other threads */
- clean_threads();
- if (nthreads >= 0) {
- dprintf(("kill other threads\n"));
- for (i = 0; i < maxpidindex; i++)
- if (pidlist[i].child > 0)
- (void) kill(pidlist[i].child,
- SIGKILL);
- _exit(exit_status);
- }
- }
- #endif /* NO_EXIT_PROG */
- waiting_for_threads = 1;
- if (ussetlock(wait_lock) < 0)
- perror("ussetlock (wait_lock)");
- for (;;) {
- if (nthreads < 0) {
- dprintf(("really exit (%d)\n", exit_status));
- if (no_cleanup)
- _exit(exit_status);
- else
- exit(exit_status);
- }
- if (usunsetlock(count_lock) < 0)
- perror("usunsetlock (count_lock)");
- dprintf(("waiting for other threads (%d)\n", nthreads));
- if (ussetlock(wait_lock) < 0)
- perror("ussetlock (wait_lock)");
- if (ussetlock(count_lock) < 0)
- perror("ussetlock (count_lock)");
- }
- }
- /* not the main thread */
- if (waiting_for_threads) {
- dprintf(("main thread is waiting\n"));
- if (usunsetlock(wait_lock) < 0)
- perror("usunsetlock (wait_lock)");
- }
- #ifndef NO_EXIT_PROG
- else if (do_exit)
- (void) kill(my_pid, SIGUSR1);
- #endif /* NO_EXIT_PROG */
- if (usunsetlock(count_lock) < 0)
- perror("usunsetlock (count_lock)");
- _exit(0);
- }
-
- void PyThread_exit_thread(void)
- {
- do_PyThread_exit_thread(0);
- }
-
- void PyThread__exit_thread(void)
- {
- do_PyThread_exit_thread(1);
- }
-
- #ifndef NO_EXIT_PROG
- static void do_PyThread_exit_prog(int status, int no_cleanup)
- {
- dprintf(("PyThread_exit_prog(%d) called\n", status));
- if (!initialized)
- if (no_cleanup)
- _exit(status);
- else
- exit(status);
- do_exit = 1;
- exit_status = status;
- do_PyThread_exit_thread(no_cleanup);
- }
-
- void PyThread_exit_prog(int status)
- {
- do_PyThread_exit_prog(status, 0);
- }
-
- void PyThread__exit_prog(int status)
- {
- do_PyThread_exit_prog(status, 1);
- }
- #endif /* NO_EXIT_PROG */
-
- /*
- * Lock support.
- */
- PyThread_type_lock PyThread_allocate_lock(void)
- {
- ulock_t lock;
-
- dprintf(("PyThread_allocate_lock called\n"));
- if (!initialized)
- PyThread_init_thread();
-
- if ((lock = usnewlock(shared_arena)) == NULL)
- perror("usnewlock");
- (void) usinitlock(lock);
- dprintf(("PyThread_allocate_lock() -> %p\n", lock));
- return (PyThread_type_lock) lock;
- }
-
- void PyThread_free_lock(PyThread_type_lock lock)
- {
- dprintf(("PyThread_free_lock(%p) called\n", lock));
- usfreelock((ulock_t) lock, shared_arena);
- }
-
- int PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
- {
- int success;
-
- dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
- errno = 0; /* clear it just in case */
- if (waitflag)
- success = ussetlock((ulock_t) lock);
- else
- success = uscsetlock((ulock_t) lock, 1); /* Try it once */
- if (success < 0)
- perror(waitflag ? "ussetlock" : "uscsetlock");
- dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
- return success;
- }
-
- void PyThread_release_lock(PyThread_type_lock lock)
- {
- dprintf(("PyThread_release_lock(%p) called\n", lock));
- if (usunsetlock((ulock_t) lock) < 0)
- perror("usunsetlock");
- }
-
- /*
- * Semaphore support.
- */
- PyThread_type_sema PyThread_allocate_sema(int value)
- {
- usema_t *sema;
- dprintf(("PyThread_allocate_sema called\n"));
- if (!initialized)
- PyThread_init_thread();
-
- if ((sema = usnewsema(shared_arena, value)) == NULL)
- perror("usnewsema");
- dprintf(("PyThread_allocate_sema() -> %p\n", sema));
- return (PyThread_type_sema) sema;
- }
-
- void PyThread_free_sema(PyThread_type_sema sema)
- {
- dprintf(("PyThread_free_sema(%p) called\n", sema));
- usfreesema((usema_t *) sema, shared_arena);
- }
-
- int PyThread_down_sema(PyThread_type_sema sema, int waitflag)
- {
- int success;
-
- dprintf(("PyThread_down_sema(%p) called\n", sema));
- if (waitflag)
- success = uspsema((usema_t *) sema);
- else
- success = uscpsema((usema_t *) sema);
- if (success < 0)
- perror(waitflag ? "uspsema" : "uscpsema");
- dprintf(("PyThread_down_sema(%p) return\n", sema));
- return success;
- }
-
- void PyThread_up_sema(PyThread_type_sema sema)
- {
- dprintf(("PyThread_up_sema(%p)\n", sema));
- if (usvsema((usema_t *) sema) < 0)
- perror("usvsema");
- }
-
- /*
- * Per-thread data ("key") support.
- */
-
- struct key {
- struct key *next;
- long id;
- int key;
- void *value;
- };
-
- static struct key *keyhead = NULL;
- static int nkeys = 0;
- static PyThread_type_lock keymutex = NULL;
-
- static struct key *find_key(int key, void *value)
- {
- struct key *p;
- long id = PyThread_get_thread_ident();
- for (p = keyhead; p != NULL; p = p->next) {
- if (p->id == id && p->key == key)
- return p;
- }
- if (value == NULL)
- return NULL;
- p = (struct key *)malloc(sizeof(struct key));
- if (p != NULL) {
- p->id = id;
- p->key = key;
- p->value = value;
- PyThread_acquire_lock(keymutex, 1);
- p->next = keyhead;
- keyhead = p;
- PyThread_release_lock(keymutex);
- }
- return p;
- }
-
- int PyThread_create_key(void)
- {
- if (keymutex == NULL)
- keymutex = PyThread_allocate_lock();
- return ++nkeys;
- }
-
- void PyThread_delete_key(int key)
- {
- struct key *p, **q;
- PyThread_acquire_lock(keymutex, 1);
- q = &keyhead;
- while ((p = *q) != NULL) {
- if (p->key == key) {
- *q = p->next;
- free((void *)p);
- /* NB This does *not* free p->value! */
- }
- else
- q = &p->next;
- }
- PyThread_release_lock(keymutex);
- }
-
- int PyThread_set_key_value(int key, void *value)
- {
- struct key *p = find_key(key, value);
- if (p == NULL)
- return -1;
- else
- return 0;
- }
-
- void *PyThread_get_key_value(int key)
- {
- struct key *p = find_key(key, NULL);
- if (p == NULL)
- return NULL;
- else
- return p->value;
- }
-